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EWG's Tap Water Database — 2021 UPDATE

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What About Lead?

Groton Utilities - click here to return to the utility page.

According to EWG’s analysis of 2019 lead testing results, this utility complied with federal water quality regulations for lead. Under the federal Lead and Copper Rule, lead concentrations must be below 15 parts per billion (ppb) in 90 percent of households sampled. If this legal limit is exceeded, the water utility must apply measures to control lead leaching from water pipes.

Number of lead samples taken in 2019: 65

Highest level detected in 2019: 470.0 ppb

Levels of lead detected


Complying with the EPA's lead rules doesn't mean that the water is safe for children to drink. The EPA’s recent modeling suggests that lead concentrations in the 3.8 to 15 ppb range can put a formula-fed baby at risk of elevated blood lead levels. In 2009, the California Office of Environmental Health Hazard Assessment set a public health goal level of 0.2 ppb for lead in drinking water to protect against even subtle IQ loss in children.

Lead Results, 2019

Samples in red indicate that the sample is above the EPA action level.

DateLab IDResult
2019-10-0430477PBCU470.0 ppb
2019-10-2330478PBCU64.0 ppb
2019-09-3030479PBCU25.0 ppb
2019-09-1830480PBCU22.0 ppb
2019-10-2230481PBCU12.0 ppb
2019-10-0430482PBCU11.0 ppb
2019-09-2430483PBCU9.00 ppb
2019-09-2730484PBCU8.20 ppb
2019-09-2730485PBCU5.80 ppb
2019-09-3030486PBCU4.40 ppb
2019-10-0130487PBCU3.00 ppb
2019-10-0230488PBCU2.00 ppb
2019-09-1930489PBCU1.80 ppb
2019-09-1830490PBCU1.80 ppb
2019-10-0830491PBCU1.50 ppb
2019-09-1930492PBCU1.40 ppb
2019-09-1930494PBCU1.30 ppb
2019-10-0330495PBCU1.30 ppb
2019-09-2030493PBCU1.30 ppb
2019-09-2730496PBCU1.10 ppb
2019-09-1930497PBCU1.000 ppb
2019-10-0130498PBCU1.000 ppb
2019-10-0830510PBCUND
2019-10-1730520PBCUND
2019-10-0230528PBCUND
2019-10-0330529PBCUND
2019-10-0330530PBCUND
2019-10-0330526PBCUND
2019-10-0930533PBCUND
2019-10-0530539PBCUND
2019-10-0730531PBCUND
2019-10-0330538PBCUND
2019-10-0430532PBCUND
2019-10-0430534PBCUND
2019-10-0430535PBCUND
2019-10-0430536PBCUND
2019-10-0430537PBCUND
2019-11-2030564IOCRND
2019-10-0430540PBCUND
2019-10-2230499PBCUND
2019-09-2430511PBCUND
2019-09-1930518PBCUND
2019-09-1930505PBCUND
2019-09-1930507PBCUND
2019-09-1930508PBCUND
2019-09-1930512PBCUND
2019-09-2330517PBCUND
2019-09-2330513PBCUND
2019-09-2330514PBCUND
2019-09-2330500PBCUND
2019-09-2430501PBCUND
2019-09-2430506PBCUND
2019-09-2430516PBCUND
2019-10-0230527PBCUND
2019-09-2530504PBCUND
2019-09-2530502PBCUND
2019-09-2730503PBCUND
2019-09-2730515PBCUND
2019-09-2730509PBCUND
2019-09-2730519PBCUND
2019-09-3030524PBCUND
2019-10-0130525PBCUND
2019-10-0130522PBCUND
2019-10-0130523PBCUND
2019-10-0230521PBCUND
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Read more about lead here.